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Commit | Line | Data |
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97fb5e8d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
18722c24 | 2 | /* |
6b8d4a6a | 3 | Copyright (c) 2013-2014 Intel Corp. |
18722c24 | 4 | |
18722c24 JR |
5 | */ |
6 | ||
18722c24 JR |
7 | #include <linux/if_arp.h> |
8 | #include <linux/netdevice.h> | |
9 | #include <linux/etherdevice.h> | |
5547e48c | 10 | #include <linux/module.h> |
6b8d4a6a | 11 | #include <linux/debugfs.h> |
18722c24 JR |
12 | |
13 | #include <net/ipv6.h> | |
14 | #include <net/ip6_route.h> | |
15 | #include <net/addrconf.h> | |
814f1b24 | 16 | #include <net/pkt_sched.h> |
18722c24 | 17 | |
18722c24 JR |
18 | #include <net/bluetooth/bluetooth.h> |
19 | #include <net/bluetooth/hci_core.h> | |
20 | #include <net/bluetooth/l2cap.h> | |
21 | ||
cefc8c8a | 22 | #include <net/6lowpan.h> /* for the compression support */ |
18722c24 | 23 | |
6b8d4a6a JR |
24 | #define VERSION "0.1" |
25 | ||
7b2ed60e | 26 | static struct dentry *lowpan_enable_debugfs; |
6b8d4a6a JR |
27 | static struct dentry *lowpan_control_debugfs; |
28 | ||
18722c24 | 29 | #define IFACE_NAME_TEMPLATE "bt%d" |
18722c24 JR |
30 | |
31 | struct skb_cb { | |
32 | struct in6_addr addr; | |
39e90c77 | 33 | struct in6_addr gw; |
6b8d4a6a | 34 | struct l2cap_chan *chan; |
18722c24 JR |
35 | }; |
36 | #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb)) | |
37 | ||
38 | /* The devices list contains those devices that we are acting | |
39 | * as a proxy. The BT 6LoWPAN device is a virtual device that | |
40 | * connects to the Bluetooth LE device. The real connection to | |
41 | * BT device is done via l2cap layer. There exists one | |
42 | * virtual device / one BT 6LoWPAN network (=hciX device). | |
43 | * The list contains struct lowpan_dev elements. | |
44 | */ | |
45 | static LIST_HEAD(bt_6lowpan_devices); | |
90305829 | 46 | static DEFINE_SPINLOCK(devices_lock); |
18722c24 | 47 | |
7b2ed60e | 48 | static bool enable_6lowpan; |
6b8d4a6a JR |
49 | |
50 | /* We are listening incoming connections via this channel | |
51 | */ | |
52 | static struct l2cap_chan *listen_chan; | |
f9c70bdc | 53 | static DEFINE_MUTEX(set_lock); |
6b8d4a6a | 54 | |
18722c24 JR |
55 | struct lowpan_peer { |
56 | struct list_head list; | |
90305829 | 57 | struct rcu_head rcu; |
6b8d4a6a | 58 | struct l2cap_chan *chan; |
18722c24 JR |
59 | |
60 | /* peer addresses in various formats */ | |
fa09ae66 | 61 | unsigned char lladdr[ETH_ALEN]; |
18722c24 JR |
62 | struct in6_addr peer_addr; |
63 | }; | |
64 | ||
2e4d60cb | 65 | struct lowpan_btle_dev { |
18722c24 JR |
66 | struct list_head list; |
67 | ||
68 | struct hci_dev *hdev; | |
69 | struct net_device *netdev; | |
70 | struct list_head peers; | |
71 | atomic_t peer_count; /* number of items in peers list */ | |
72 | ||
73 | struct work_struct delete_netdev; | |
74 | struct delayed_work notify_peers; | |
75 | }; | |
76 | ||
2e4d60cb AA |
77 | static inline struct lowpan_btle_dev * |
78 | lowpan_btle_dev(const struct net_device *netdev) | |
18722c24 | 79 | { |
2e4d60cb | 80 | return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv; |
18722c24 JR |
81 | } |
82 | ||
2e4d60cb AA |
83 | static inline void peer_add(struct lowpan_btle_dev *dev, |
84 | struct lowpan_peer *peer) | |
18722c24 | 85 | { |
90305829 | 86 | list_add_rcu(&peer->list, &dev->peers); |
18722c24 JR |
87 | atomic_inc(&dev->peer_count); |
88 | } | |
89 | ||
2e4d60cb AA |
90 | static inline bool peer_del(struct lowpan_btle_dev *dev, |
91 | struct lowpan_peer *peer) | |
18722c24 | 92 | { |
90305829 | 93 | list_del_rcu(&peer->list); |
4e790226 | 94 | kfree_rcu(peer, rcu); |
18722c24 | 95 | |
18d93c17 JR |
96 | module_put(THIS_MODULE); |
97 | ||
18722c24 JR |
98 | if (atomic_dec_and_test(&dev->peer_count)) { |
99 | BT_DBG("last peer"); | |
100 | return true; | |
101 | } | |
102 | ||
103 | return false; | |
104 | } | |
105 | ||
2e4d60cb | 106 | static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_btle_dev *dev, |
18722c24 JR |
107 | bdaddr_t *ba, __u8 type) |
108 | { | |
90305829 | 109 | struct lowpan_peer *peer; |
18722c24 JR |
110 | |
111 | BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count), | |
112 | ba, type); | |
113 | ||
90305829 JR |
114 | rcu_read_lock(); |
115 | ||
116 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
6b8d4a6a JR |
117 | BT_DBG("dst addr %pMR dst type %d", |
118 | &peer->chan->dst, peer->chan->dst_type); | |
18722c24 | 119 | |
6b8d4a6a | 120 | if (bacmp(&peer->chan->dst, ba)) |
18722c24 JR |
121 | continue; |
122 | ||
90305829 JR |
123 | if (type == peer->chan->dst_type) { |
124 | rcu_read_unlock(); | |
6b8d4a6a | 125 | return peer; |
90305829 | 126 | } |
6b8d4a6a JR |
127 | } |
128 | ||
90305829 JR |
129 | rcu_read_unlock(); |
130 | ||
6b8d4a6a JR |
131 | return NULL; |
132 | } | |
133 | ||
2e4d60cb AA |
134 | static inline struct lowpan_peer * |
135 | __peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan) | |
6b8d4a6a | 136 | { |
90305829 | 137 | struct lowpan_peer *peer; |
6b8d4a6a | 138 | |
90305829 | 139 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 140 | if (peer->chan == chan) |
18722c24 JR |
141 | return peer; |
142 | } | |
143 | ||
144 | return NULL; | |
145 | } | |
146 | ||
2e4d60cb AA |
147 | static inline struct lowpan_peer * |
148 | __peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn) | |
18722c24 | 149 | { |
90305829 | 150 | struct lowpan_peer *peer; |
18722c24 | 151 | |
90305829 | 152 | list_for_each_entry_rcu(peer, &dev->peers, list) { |
6b8d4a6a | 153 | if (peer->chan->conn == conn) |
18722c24 JR |
154 | return peer; |
155 | } | |
156 | ||
157 | return NULL; | |
158 | } | |
159 | ||
2e4d60cb | 160 | static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev, |
39e90c77 JR |
161 | struct in6_addr *daddr, |
162 | struct sk_buff *skb) | |
163 | { | |
39e90c77 JR |
164 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
165 | int count = atomic_read(&dev->peer_count); | |
9b1c1ef1 ND |
166 | const struct in6_addr *nexthop; |
167 | struct lowpan_peer *peer; | |
5636376c | 168 | struct neighbour *neigh; |
39e90c77 JR |
169 | |
170 | BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt); | |
171 | ||
39e90c77 | 172 | if (!rt) { |
b188b032 JM |
173 | if (ipv6_addr_any(&lowpan_cb(skb)->gw)) { |
174 | /* There is neither route nor gateway, | |
175 | * probably the destination is a direct peer. | |
176 | */ | |
177 | nexthop = daddr; | |
178 | } else { | |
179 | /* There is a known gateway | |
180 | */ | |
181 | nexthop = &lowpan_cb(skb)->gw; | |
182 | } | |
39e90c77 | 183 | } else { |
2647a9b0 | 184 | nexthop = rt6_nexthop(rt, daddr); |
39e90c77 JR |
185 | |
186 | /* We need to remember the address because it is needed | |
187 | * by bt_xmit() when sending the packet. In bt_xmit(), the | |
188 | * destination routing info is not set. | |
189 | */ | |
190 | memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr)); | |
191 | } | |
192 | ||
193 | BT_DBG("gw %pI6c", nexthop); | |
194 | ||
90305829 JR |
195 | rcu_read_lock(); |
196 | ||
197 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
39e90c77 JR |
198 | BT_DBG("dst addr %pMR dst type %d ip %pI6c", |
199 | &peer->chan->dst, peer->chan->dst_type, | |
200 | &peer->peer_addr); | |
201 | ||
90305829 JR |
202 | if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) { |
203 | rcu_read_unlock(); | |
39e90c77 | 204 | return peer; |
90305829 | 205 | } |
39e90c77 JR |
206 | } |
207 | ||
5636376c JM |
208 | /* use the neighbour cache for matching addresses assigned by SLAAC |
209 | */ | |
210 | neigh = __ipv6_neigh_lookup(dev->netdev, nexthop); | |
211 | if (neigh) { | |
212 | list_for_each_entry_rcu(peer, &dev->peers, list) { | |
213 | if (!memcmp(neigh->ha, peer->lladdr, ETH_ALEN)) { | |
214 | neigh_release(neigh); | |
215 | rcu_read_unlock(); | |
216 | return peer; | |
217 | } | |
218 | } | |
219 | neigh_release(neigh); | |
220 | } | |
221 | ||
90305829 JR |
222 | rcu_read_unlock(); |
223 | ||
39e90c77 JR |
224 | return NULL; |
225 | } | |
226 | ||
18722c24 JR |
227 | static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn) |
228 | { | |
2e4d60cb | 229 | struct lowpan_btle_dev *entry; |
18722c24 | 230 | struct lowpan_peer *peer = NULL; |
18722c24 | 231 | |
90305829 | 232 | rcu_read_lock(); |
18722c24 | 233 | |
90305829 JR |
234 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
235 | peer = __peer_lookup_conn(entry, conn); | |
18722c24 JR |
236 | if (peer) |
237 | break; | |
238 | } | |
239 | ||
90305829 | 240 | rcu_read_unlock(); |
18722c24 JR |
241 | |
242 | return peer; | |
243 | } | |
244 | ||
2e4d60cb | 245 | static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn) |
18722c24 | 246 | { |
2e4d60cb AA |
247 | struct lowpan_btle_dev *entry; |
248 | struct lowpan_btle_dev *dev = NULL; | |
18722c24 | 249 | |
90305829 | 250 | rcu_read_lock(); |
18722c24 | 251 | |
90305829 | 252 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
18722c24 JR |
253 | if (conn->hcon->hdev == entry->hdev) { |
254 | dev = entry; | |
255 | break; | |
256 | } | |
257 | } | |
258 | ||
90305829 | 259 | rcu_read_unlock(); |
18722c24 JR |
260 | |
261 | return dev; | |
262 | } | |
263 | ||
18722c24 JR |
264 | static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev) |
265 | { | |
266 | struct sk_buff *skb_cp; | |
18722c24 JR |
267 | |
268 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
269 | if (!skb_cp) | |
f8b36176 | 270 | return NET_RX_DROP; |
18722c24 | 271 | |
324e786e | 272 | return netif_rx_ni(skb_cp); |
18722c24 JR |
273 | } |
274 | ||
01141234 | 275 | static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev, |
27ce68a3 | 276 | struct lowpan_peer *peer) |
18722c24 | 277 | { |
c259d141 | 278 | const u8 *saddr; |
18722c24 | 279 | |
fa09ae66 | 280 | saddr = peer->lladdr; |
18722c24 | 281 | |
fa09ae66 | 282 | return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr); |
18722c24 JR |
283 | } |
284 | ||
285 | static int recv_pkt(struct sk_buff *skb, struct net_device *dev, | |
27ce68a3 | 286 | struct lowpan_peer *peer) |
18722c24 JR |
287 | { |
288 | struct sk_buff *local_skb; | |
289 | int ret; | |
290 | ||
291 | if (!netif_running(dev)) | |
292 | goto drop; | |
293 | ||
cefdb801 | 294 | if (dev->type != ARPHRD_6LOWPAN || !skb->len) |
18722c24 JR |
295 | goto drop; |
296 | ||
cefdb801 AA |
297 | skb_reset_network_header(skb); |
298 | ||
11e3ff70 MT |
299 | skb = skb_share_check(skb, GFP_ATOMIC); |
300 | if (!skb) | |
301 | goto drop; | |
302 | ||
18722c24 | 303 | /* check that it's our buffer */ |
cefdb801 | 304 | if (lowpan_is_ipv6(*skb_network_header(skb))) { |
87f5fedb LD |
305 | /* Pull off the 1-byte of 6lowpan header. */ |
306 | skb_pull(skb, 1); | |
307 | ||
18722c24 JR |
308 | /* Copy the packet so that the IPv6 header is |
309 | * properly aligned. | |
310 | */ | |
311 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
312 | skb_tailroom(skb), GFP_ATOMIC); | |
313 | if (!local_skb) | |
314 | goto drop; | |
315 | ||
316 | local_skb->protocol = htons(ETH_P_IPV6); | |
317 | local_skb->pkt_type = PACKET_HOST; | |
4c58f328 | 318 | local_skb->dev = dev; |
18722c24 | 319 | |
18722c24 JR |
320 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); |
321 | ||
322 | if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) { | |
323 | kfree_skb(local_skb); | |
324 | goto drop; | |
325 | } | |
326 | ||
327 | dev->stats.rx_bytes += skb->len; | |
328 | dev->stats.rx_packets++; | |
329 | ||
3c400b84 MT |
330 | consume_skb(local_skb); |
331 | consume_skb(skb); | |
cefdb801 AA |
332 | } else if (lowpan_is_iphc(*skb_network_header(skb))) { |
333 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
334 | if (!local_skb) | |
335 | goto drop; | |
336 | ||
4c58f328 GRB |
337 | local_skb->dev = dev; |
338 | ||
27ce68a3 | 339 | ret = iphc_decompress(local_skb, dev, peer); |
cefdb801 | 340 | if (ret < 0) { |
da75fdc6 | 341 | BT_DBG("iphc_decompress failed: %d", ret); |
cefdb801 AA |
342 | kfree_skb(local_skb); |
343 | goto drop; | |
344 | } | |
345 | ||
346 | local_skb->protocol = htons(ETH_P_IPV6); | |
347 | local_skb->pkt_type = PACKET_HOST; | |
cefdb801 AA |
348 | |
349 | if (give_skb_to_upper(local_skb, dev) | |
350 | != NET_RX_SUCCESS) { | |
351 | kfree_skb(local_skb); | |
352 | goto drop; | |
18722c24 | 353 | } |
cefdb801 AA |
354 | |
355 | dev->stats.rx_bytes += skb->len; | |
356 | dev->stats.rx_packets++; | |
357 | ||
358 | consume_skb(local_skb); | |
359 | consume_skb(skb); | |
360 | } else { | |
da75fdc6 | 361 | BT_DBG("unknown packet type"); |
cefdb801 | 362 | goto drop; |
18722c24 JR |
363 | } |
364 | ||
365 | return NET_RX_SUCCESS; | |
366 | ||
367 | drop: | |
6b8d4a6a | 368 | dev->stats.rx_dropped++; |
18722c24 JR |
369 | return NET_RX_DROP; |
370 | } | |
371 | ||
372 | /* Packet from BT LE device */ | |
6b8d4a6a | 373 | static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
18722c24 | 374 | { |
2e4d60cb | 375 | struct lowpan_btle_dev *dev; |
18722c24 JR |
376 | struct lowpan_peer *peer; |
377 | int err; | |
378 | ||
6b8d4a6a | 379 | peer = lookup_peer(chan->conn); |
18722c24 JR |
380 | if (!peer) |
381 | return -ENOENT; | |
382 | ||
6b8d4a6a | 383 | dev = lookup_dev(chan->conn); |
30d3db44 | 384 | if (!dev || !dev->netdev) |
18722c24 JR |
385 | return -ENOENT; |
386 | ||
27ce68a3 | 387 | err = recv_pkt(skb, dev->netdev, peer); |
6b8d4a6a JR |
388 | if (err) { |
389 | BT_DBG("recv pkt %d", err); | |
390 | err = -EAGAIN; | |
18722c24 JR |
391 | } |
392 | ||
6b8d4a6a | 393 | return err; |
18722c24 JR |
394 | } |
395 | ||
36b3dd25 JR |
396 | static int setup_header(struct sk_buff *skb, struct net_device *netdev, |
397 | bdaddr_t *peer_addr, u8 *peer_addr_type) | |
18722c24 | 398 | { |
36b3dd25 | 399 | struct in6_addr ipv6_daddr; |
55441070 | 400 | struct ipv6hdr *hdr; |
2e4d60cb | 401 | struct lowpan_btle_dev *dev; |
18722c24 | 402 | struct lowpan_peer *peer; |
9dae2e03 | 403 | u8 *daddr; |
36b3dd25 | 404 | int err, status = 0; |
18722c24 | 405 | |
55441070 GRB |
406 | hdr = ipv6_hdr(skb); |
407 | ||
2e4d60cb | 408 | dev = lowpan_btle_dev(netdev); |
18722c24 | 409 | |
55441070 | 410 | memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr)); |
36b3dd25 JR |
411 | |
412 | if (ipv6_addr_is_multicast(&ipv6_daddr)) { | |
6b8d4a6a | 413 | lowpan_cb(skb)->chan = NULL; |
9dae2e03 | 414 | daddr = NULL; |
18722c24 | 415 | } else { |
9dae2e03 | 416 | BT_DBG("dest IP %pI6c", &ipv6_daddr); |
18722c24 | 417 | |
9dae2e03 LAD |
418 | /* The packet might be sent to 6lowpan interface |
419 | * because of routing (either via default route | |
420 | * or user set route) so get peer according to | |
421 | * the destination address. | |
18722c24 | 422 | */ |
9dae2e03 | 423 | peer = peer_lookup_dst(dev, &ipv6_daddr, skb); |
18722c24 | 424 | if (!peer) { |
9dae2e03 LAD |
425 | BT_DBG("no such peer"); |
426 | return -ENOENT; | |
18722c24 JR |
427 | } |
428 | ||
fa09ae66 | 429 | daddr = peer->lladdr; |
fa0eaf84 | 430 | *peer_addr = peer->chan->dst; |
9dae2e03 | 431 | *peer_addr_type = peer->chan->dst_type; |
6b8d4a6a | 432 | lowpan_cb(skb)->chan = peer->chan; |
36b3dd25 JR |
433 | |
434 | status = 1; | |
18722c24 JR |
435 | } |
436 | ||
a6f77389 | 437 | lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr); |
36b3dd25 JR |
438 | |
439 | err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0); | |
440 | if (err < 0) | |
441 | return err; | |
442 | ||
443 | return status; | |
444 | } | |
445 | ||
446 | static int header_create(struct sk_buff *skb, struct net_device *netdev, | |
447 | unsigned short type, const void *_daddr, | |
448 | const void *_saddr, unsigned int len) | |
449 | { | |
36b3dd25 JR |
450 | if (type != ETH_P_IPV6) |
451 | return -EINVAL; | |
452 | ||
36b3dd25 | 453 | return 0; |
18722c24 JR |
454 | } |
455 | ||
456 | /* Packet to BT LE device */ | |
6b8d4a6a | 457 | static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb, |
d7b6b0a5 | 458 | struct net_device *netdev) |
18722c24 | 459 | { |
6b8d4a6a JR |
460 | struct msghdr msg; |
461 | struct kvec iv; | |
462 | int err; | |
463 | ||
464 | /* Remember the skb so that we can send EAGAIN to the caller if | |
d7b6b0a5 | 465 | * we run out of credits. |
6b8d4a6a | 466 | */ |
d7b6b0a5 | 467 | chan->data = skb; |
6b8d4a6a | 468 | |
6b8d4a6a JR |
469 | iv.iov_base = skb->data; |
470 | iv.iov_len = skb->len; | |
471 | ||
c0371da6 | 472 | memset(&msg, 0, sizeof(msg)); |
aa563d7b | 473 | iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, skb->len); |
c0371da6 | 474 | |
6b8d4a6a JR |
475 | err = l2cap_chan_send(chan, &msg, skb->len); |
476 | if (err > 0) { | |
477 | netdev->stats.tx_bytes += err; | |
478 | netdev->stats.tx_packets++; | |
479 | return 0; | |
480 | } | |
481 | ||
e1008f95 LAD |
482 | if (err < 0) |
483 | netdev->stats.tx_errors++; | |
18722c24 | 484 | |
6b8d4a6a | 485 | return err; |
18722c24 JR |
486 | } |
487 | ||
9c238ca8 | 488 | static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) |
18722c24 JR |
489 | { |
490 | struct sk_buff *local_skb; | |
2e4d60cb | 491 | struct lowpan_btle_dev *entry; |
9c238ca8 | 492 | int err = 0; |
18722c24 | 493 | |
90305829 | 494 | rcu_read_lock(); |
18722c24 | 495 | |
90305829 JR |
496 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
497 | struct lowpan_peer *pentry; | |
2e4d60cb | 498 | struct lowpan_btle_dev *dev; |
18722c24 JR |
499 | |
500 | if (entry->netdev != netdev) | |
501 | continue; | |
502 | ||
2e4d60cb | 503 | dev = lowpan_btle_dev(entry->netdev); |
18722c24 | 504 | |
90305829 | 505 | list_for_each_entry_rcu(pentry, &dev->peers, list) { |
9c238ca8 JR |
506 | int ret; |
507 | ||
18722c24 JR |
508 | local_skb = skb_clone(skb, GFP_ATOMIC); |
509 | ||
36b3dd25 JR |
510 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", |
511 | netdev->name, | |
512 | &pentry->chan->dst, pentry->chan->dst_type, | |
513 | &pentry->peer_addr, pentry->chan); | |
9c238ca8 JR |
514 | ret = send_pkt(pentry->chan, local_skb, netdev); |
515 | if (ret < 0) | |
516 | err = ret; | |
18722c24 JR |
517 | |
518 | kfree_skb(local_skb); | |
519 | } | |
520 | } | |
521 | ||
90305829 | 522 | rcu_read_unlock(); |
9c238ca8 JR |
523 | |
524 | return err; | |
18722c24 JR |
525 | } |
526 | ||
527 | static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) | |
528 | { | |
529 | int err = 0; | |
18722c24 JR |
530 | bdaddr_t addr; |
531 | u8 addr_type; | |
532 | ||
36b3dd25 JR |
533 | /* We must take a copy of the skb before we modify/replace the ipv6 |
534 | * header as the header could be used elsewhere | |
535 | */ | |
b0c42cd7 AA |
536 | skb = skb_unshare(skb, GFP_ATOMIC); |
537 | if (!skb) | |
36b3dd25 JR |
538 | return NET_XMIT_DROP; |
539 | ||
540 | /* Return values from setup_header() | |
541 | * <0 - error, packet is dropped | |
542 | * 0 - this is a multicast packet | |
543 | * 1 - this is unicast packet | |
544 | */ | |
545 | err = setup_header(skb, netdev, &addr, &addr_type); | |
546 | if (err < 0) { | |
547 | kfree_skb(skb); | |
548 | return NET_XMIT_DROP; | |
549 | } | |
18722c24 | 550 | |
36b3dd25 JR |
551 | if (err) { |
552 | if (lowpan_cb(skb)->chan) { | |
553 | BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p", | |
554 | netdev->name, &addr, addr_type, | |
555 | &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan); | |
d7b6b0a5 | 556 | err = send_pkt(lowpan_cb(skb)->chan, skb, netdev); |
36b3dd25 | 557 | } else { |
6b8d4a6a | 558 | err = -ENOENT; |
36b3dd25 JR |
559 | } |
560 | } else { | |
561 | /* We need to send the packet to every device behind this | |
562 | * interface. | |
563 | */ | |
9c238ca8 | 564 | err = send_mcast_pkt(skb, netdev); |
18722c24 | 565 | } |
18722c24 | 566 | |
fc12518a JR |
567 | dev_kfree_skb(skb); |
568 | ||
18722c24 JR |
569 | if (err) |
570 | BT_DBG("ERROR: xmit failed (%d)", err); | |
571 | ||
36b3dd25 | 572 | return err < 0 ? NET_XMIT_DROP : err; |
18722c24 JR |
573 | } |
574 | ||
1a33e10e CW |
575 | static int bt_dev_init(struct net_device *dev) |
576 | { | |
577 | netdev_lockdep_set_classes(dev); | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
18722c24 | 582 | static const struct net_device_ops netdev_ops = { |
1a33e10e | 583 | .ndo_init = bt_dev_init, |
18722c24 JR |
584 | .ndo_start_xmit = bt_xmit, |
585 | }; | |
586 | ||
569428da | 587 | static const struct header_ops header_ops = { |
18722c24 JR |
588 | .create = header_create, |
589 | }; | |
590 | ||
591 | static void netdev_setup(struct net_device *dev) | |
592 | { | |
18722c24 JR |
593 | dev->hard_header_len = 0; |
594 | dev->needed_tailroom = 0; | |
25869522 | 595 | dev->flags = IFF_RUNNING | IFF_MULTICAST; |
18722c24 | 596 | dev->watchdog_timeo = 0; |
814f1b24 | 597 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
18722c24 JR |
598 | |
599 | dev->netdev_ops = &netdev_ops; | |
600 | dev->header_ops = &header_ops; | |
cf124db5 | 601 | dev->needs_free_netdev = true; |
18722c24 JR |
602 | } |
603 | ||
604 | static struct device_type bt_type = { | |
605 | .name = "bluetooth", | |
606 | }; | |
607 | ||
18722c24 JR |
608 | static void ifup(struct net_device *netdev) |
609 | { | |
610 | int err; | |
611 | ||
612 | rtnl_lock(); | |
00f54e68 | 613 | err = dev_open(netdev, NULL); |
18722c24 JR |
614 | if (err < 0) |
615 | BT_INFO("iface %s cannot be opened (%d)", netdev->name, err); | |
616 | rtnl_unlock(); | |
617 | } | |
618 | ||
7f118253 JR |
619 | static void ifdown(struct net_device *netdev) |
620 | { | |
7f118253 | 621 | rtnl_lock(); |
ddee3103 | 622 | dev_close(netdev); |
7f118253 JR |
623 | rtnl_unlock(); |
624 | } | |
625 | ||
18722c24 JR |
626 | static void do_notify_peers(struct work_struct *work) |
627 | { | |
2e4d60cb AA |
628 | struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev, |
629 | notify_peers.work); | |
18722c24 JR |
630 | |
631 | netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */ | |
632 | } | |
633 | ||
634 | static bool is_bt_6lowpan(struct hci_conn *hcon) | |
635 | { | |
636 | if (hcon->type != LE_LINK) | |
637 | return false; | |
638 | ||
7b2ed60e | 639 | if (!enable_6lowpan) |
6b8d4a6a JR |
640 | return false; |
641 | ||
642 | return true; | |
18722c24 JR |
643 | } |
644 | ||
6b8d4a6a JR |
645 | static struct l2cap_chan *chan_create(void) |
646 | { | |
647 | struct l2cap_chan *chan; | |
648 | ||
649 | chan = l2cap_chan_create(); | |
650 | if (!chan) | |
651 | return NULL; | |
652 | ||
653 | l2cap_chan_set_defaults(chan); | |
654 | ||
655 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; | |
656 | chan->mode = L2CAP_MODE_LE_FLOWCTL; | |
301de2cb | 657 | chan->imtu = 1280; |
6b8d4a6a JR |
658 | |
659 | return chan; | |
660 | } | |
661 | ||
6b8d4a6a | 662 | static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan, |
d2891c4d MS |
663 | struct lowpan_btle_dev *dev, |
664 | bool new_netdev) | |
18722c24 JR |
665 | { |
666 | struct lowpan_peer *peer; | |
18722c24 JR |
667 | |
668 | peer = kzalloc(sizeof(*peer), GFP_ATOMIC); | |
669 | if (!peer) | |
6b8d4a6a | 670 | return NULL; |
18722c24 | 671 | |
6b8d4a6a | 672 | peer->chan = chan; |
18722c24 JR |
673 | memset(&peer->peer_addr, 0, sizeof(struct in6_addr)); |
674 | ||
fa09ae66 | 675 | baswap((void *)peer->lladdr, &chan->dst); |
18722c24 | 676 | |
fa09ae66 | 677 | lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr); |
18722c24 | 678 | |
90305829 | 679 | spin_lock(&devices_lock); |
18722c24 JR |
680 | INIT_LIST_HEAD(&peer->list); |
681 | peer_add(dev, peer); | |
90305829 | 682 | spin_unlock(&devices_lock); |
18722c24 JR |
683 | |
684 | /* Notifying peers about us needs to be done without locks held */ | |
d2891c4d MS |
685 | if (new_netdev) |
686 | INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers); | |
18722c24 JR |
687 | schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100)); |
688 | ||
6b8d4a6a | 689 | return peer->chan; |
18722c24 JR |
690 | } |
691 | ||
2e4d60cb | 692 | static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev) |
18722c24 | 693 | { |
18722c24 JR |
694 | struct net_device *netdev; |
695 | int err = 0; | |
18722c24 | 696 | |
2e4d60cb | 697 | netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)), |
b72f6f51 AA |
698 | IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN, |
699 | netdev_setup); | |
18722c24 JR |
700 | if (!netdev) |
701 | return -ENOMEM; | |
702 | ||
c259d141 PF |
703 | netdev->addr_assign_type = NET_ADDR_PERM; |
704 | baswap((void *)netdev->dev_addr, &chan->src); | |
18722c24 JR |
705 | |
706 | netdev->netdev_ops = &netdev_ops; | |
fc84242f | 707 | SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev); |
18722c24 JR |
708 | SET_NETDEV_DEVTYPE(netdev, &bt_type); |
709 | ||
2e4d60cb | 710 | *dev = lowpan_btle_dev(netdev); |
5857d1db AA |
711 | (*dev)->netdev = netdev; |
712 | (*dev)->hdev = chan->conn->hcon->hdev; | |
713 | INIT_LIST_HEAD(&(*dev)->peers); | |
714 | ||
715 | spin_lock(&devices_lock); | |
716 | INIT_LIST_HEAD(&(*dev)->list); | |
717 | list_add_rcu(&(*dev)->list, &bt_6lowpan_devices); | |
718 | spin_unlock(&devices_lock); | |
719 | ||
00f59314 | 720 | err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE); |
18722c24 JR |
721 | if (err < 0) { |
722 | BT_INFO("register_netdev failed %d", err); | |
5857d1db AA |
723 | spin_lock(&devices_lock); |
724 | list_del_rcu(&(*dev)->list); | |
725 | spin_unlock(&devices_lock); | |
18722c24 JR |
726 | free_netdev(netdev); |
727 | goto out; | |
728 | } | |
729 | ||
6b8d4a6a JR |
730 | BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d", |
731 | netdev->ifindex, &chan->dst, chan->dst_type, | |
732 | &chan->src, chan->src_type); | |
18722c24 JR |
733 | set_bit(__LINK_STATE_PRESENT, &netdev->state); |
734 | ||
6b8d4a6a | 735 | return 0; |
18722c24 JR |
736 | |
737 | out: | |
738 | return err; | |
739 | } | |
740 | ||
6b8d4a6a JR |
741 | static inline void chan_ready_cb(struct l2cap_chan *chan) |
742 | { | |
2e4d60cb | 743 | struct lowpan_btle_dev *dev; |
d2891c4d | 744 | bool new_netdev = false; |
6b8d4a6a JR |
745 | |
746 | dev = lookup_dev(chan->conn); | |
747 | ||
748 | BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev); | |
749 | ||
750 | if (!dev) { | |
751 | if (setup_netdev(chan, &dev) < 0) { | |
752 | l2cap_chan_del(chan, -ENOENT); | |
753 | return; | |
754 | } | |
d2891c4d | 755 | new_netdev = true; |
6b8d4a6a JR |
756 | } |
757 | ||
18d93c17 JR |
758 | if (!try_module_get(THIS_MODULE)) |
759 | return; | |
760 | ||
d2891c4d | 761 | add_peer_chan(chan, dev, new_netdev); |
6b8d4a6a JR |
762 | ifup(dev->netdev); |
763 | } | |
764 | ||
2b293490 | 765 | static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan) |
6b8d4a6a | 766 | { |
2b293490 | 767 | struct l2cap_chan *chan; |
6b8d4a6a | 768 | |
630ef791 JH |
769 | chan = chan_create(); |
770 | if (!chan) | |
771 | return NULL; | |
772 | ||
2b293490 | 773 | chan->ops = pchan->ops; |
6b8d4a6a JR |
774 | |
775 | BT_DBG("chan %p pchan %p", chan, pchan); | |
776 | ||
2b293490 | 777 | return chan; |
6b8d4a6a JR |
778 | } |
779 | ||
18722c24 JR |
780 | static void delete_netdev(struct work_struct *work) |
781 | { | |
2e4d60cb AA |
782 | struct lowpan_btle_dev *entry = container_of(work, |
783 | struct lowpan_btle_dev, | |
784 | delete_netdev); | |
18722c24 | 785 | |
00f59314 | 786 | lowpan_unregister_netdev(entry->netdev); |
18722c24 | 787 | |
2ad88fb2 | 788 | /* The entry pointer is deleted by the netdev destructor. */ |
18722c24 JR |
789 | } |
790 | ||
6b8d4a6a | 791 | static void chan_close_cb(struct l2cap_chan *chan) |
18722c24 | 792 | { |
2e4d60cb AA |
793 | struct lowpan_btle_dev *entry; |
794 | struct lowpan_btle_dev *dev = NULL; | |
18722c24 JR |
795 | struct lowpan_peer *peer; |
796 | int err = -ENOENT; | |
f63666d2 | 797 | bool last = false, remove = true; |
18722c24 | 798 | |
6b8d4a6a JR |
799 | BT_DBG("chan %p conn %p", chan, chan->conn); |
800 | ||
801 | if (chan->conn && chan->conn->hcon) { | |
802 | if (!is_bt_6lowpan(chan->conn->hcon)) | |
803 | return; | |
804 | ||
805 | /* If conn is set, then the netdev is also there and we should | |
806 | * not remove it. | |
807 | */ | |
f63666d2 | 808 | remove = false; |
6b8d4a6a | 809 | } |
18722c24 | 810 | |
90305829 | 811 | spin_lock(&devices_lock); |
18722c24 | 812 | |
90305829 | 813 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
2e4d60cb | 814 | dev = lowpan_btle_dev(entry->netdev); |
90305829 | 815 | peer = __peer_lookup_chan(dev, chan); |
18722c24 JR |
816 | if (peer) { |
817 | last = peer_del(dev, peer); | |
818 | err = 0; | |
6b8d4a6a JR |
819 | |
820 | BT_DBG("dev %p removing %speer %p", dev, | |
821 | last ? "last " : "1 ", peer); | |
822 | BT_DBG("chan %p orig refcnt %d", chan, | |
2c935bc5 | 823 | kref_read(&chan->kref)); |
6b8d4a6a JR |
824 | |
825 | l2cap_chan_put(chan); | |
18722c24 JR |
826 | break; |
827 | } | |
828 | } | |
829 | ||
830 | if (!err && last && dev && !atomic_read(&dev->peer_count)) { | |
90305829 | 831 | spin_unlock(&devices_lock); |
18722c24 JR |
832 | |
833 | cancel_delayed_work_sync(&dev->notify_peers); | |
834 | ||
7f118253 JR |
835 | ifdown(dev->netdev); |
836 | ||
f63666d2 | 837 | if (remove) { |
6b8d4a6a JR |
838 | INIT_WORK(&entry->delete_netdev, delete_netdev); |
839 | schedule_work(&entry->delete_netdev); | |
840 | } | |
18722c24 | 841 | } else { |
90305829 | 842 | spin_unlock(&devices_lock); |
18722c24 JR |
843 | } |
844 | ||
6b8d4a6a JR |
845 | return; |
846 | } | |
847 | ||
848 | static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err) | |
849 | { | |
850 | BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn, | |
851 | state_to_string(state), err); | |
852 | } | |
853 | ||
854 | static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan, | |
855 | unsigned long hdr_len, | |
856 | unsigned long len, int nb) | |
857 | { | |
858 | /* Note that we must allocate using GFP_ATOMIC here as | |
859 | * this function is called originally from netdev hard xmit | |
860 | * function in atomic context. | |
861 | */ | |
862 | return bt_skb_alloc(hdr_len + len, GFP_ATOMIC); | |
863 | } | |
864 | ||
865 | static void chan_suspend_cb(struct l2cap_chan *chan) | |
866 | { | |
f183e52b LAD |
867 | struct lowpan_btle_dev *dev; |
868 | ||
6dea44f5 | 869 | BT_DBG("chan %p suspend", chan); |
f183e52b LAD |
870 | |
871 | dev = lookup_dev(chan->conn); | |
872 | if (!dev || !dev->netdev) | |
873 | return; | |
874 | ||
875 | netif_stop_queue(dev->netdev); | |
6b8d4a6a JR |
876 | } |
877 | ||
878 | static void chan_resume_cb(struct l2cap_chan *chan) | |
879 | { | |
f183e52b LAD |
880 | struct lowpan_btle_dev *dev; |
881 | ||
6dea44f5 | 882 | BT_DBG("chan %p resume", chan); |
f183e52b LAD |
883 | |
884 | dev = lookup_dev(chan->conn); | |
885 | if (!dev || !dev->netdev) | |
886 | return; | |
887 | ||
888 | netif_wake_queue(dev->netdev); | |
6b8d4a6a JR |
889 | } |
890 | ||
891 | static long chan_get_sndtimeo_cb(struct l2cap_chan *chan) | |
892 | { | |
2ae50d8d | 893 | return L2CAP_CONN_TIMEOUT; |
6b8d4a6a JR |
894 | } |
895 | ||
896 | static const struct l2cap_ops bt_6lowpan_chan_ops = { | |
897 | .name = "L2CAP 6LoWPAN channel", | |
898 | .new_connection = chan_new_conn_cb, | |
899 | .recv = chan_recv_cb, | |
900 | .close = chan_close_cb, | |
901 | .state_change = chan_state_change_cb, | |
902 | .ready = chan_ready_cb, | |
903 | .resume = chan_resume_cb, | |
904 | .suspend = chan_suspend_cb, | |
905 | .get_sndtimeo = chan_get_sndtimeo_cb, | |
906 | .alloc_skb = chan_alloc_skb_cb, | |
6b8d4a6a JR |
907 | |
908 | .teardown = l2cap_chan_no_teardown, | |
909 | .defer = l2cap_chan_no_defer, | |
910 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
911 | }; | |
912 | ||
913 | static inline __u8 bdaddr_type(__u8 type) | |
914 | { | |
915 | if (type == ADDR_LE_DEV_PUBLIC) | |
916 | return BDADDR_LE_PUBLIC; | |
917 | else | |
918 | return BDADDR_LE_RANDOM; | |
919 | } | |
920 | ||
6b8d4a6a JR |
921 | static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type) |
922 | { | |
0cd088fc | 923 | struct l2cap_chan *chan; |
6b8d4a6a JR |
924 | int err; |
925 | ||
26d46dff | 926 | chan = chan_create(); |
0cd088fc | 927 | if (!chan) |
6b8d4a6a JR |
928 | return -EINVAL; |
929 | ||
26d46dff JH |
930 | chan->ops = &bt_6lowpan_chan_ops; |
931 | ||
0cd088fc | 932 | err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0, |
6b8d4a6a JR |
933 | addr, dst_type); |
934 | ||
0cd088fc | 935 | BT_DBG("chan %p err %d", chan, err); |
6b8d4a6a | 936 | if (err < 0) |
0cd088fc | 937 | l2cap_chan_put(chan); |
6b8d4a6a | 938 | |
18722c24 JR |
939 | return err; |
940 | } | |
941 | ||
6b8d4a6a JR |
942 | static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type) |
943 | { | |
944 | struct lowpan_peer *peer; | |
945 | ||
946 | BT_DBG("conn %p dst type %d", conn, dst_type); | |
947 | ||
948 | peer = lookup_peer(conn); | |
949 | if (!peer) | |
950 | return -ENOENT; | |
951 | ||
952 | BT_DBG("peer %p chan %p", peer, peer->chan); | |
953 | ||
954 | l2cap_chan_close(peer->chan, ENOENT); | |
955 | ||
956 | return 0; | |
957 | } | |
958 | ||
959 | static struct l2cap_chan *bt_6lowpan_listen(void) | |
960 | { | |
961 | bdaddr_t *addr = BDADDR_ANY; | |
0cd088fc | 962 | struct l2cap_chan *chan; |
6b8d4a6a JR |
963 | int err; |
964 | ||
7b2ed60e | 965 | if (!enable_6lowpan) |
6b8d4a6a JR |
966 | return NULL; |
967 | ||
26d46dff | 968 | chan = chan_create(); |
0cd088fc | 969 | if (!chan) |
6b8d4a6a JR |
970 | return NULL; |
971 | ||
26d46dff | 972 | chan->ops = &bt_6lowpan_chan_ops; |
0cd088fc JH |
973 | chan->state = BT_LISTEN; |
974 | chan->src_type = BDADDR_LE_PUBLIC; | |
6b8d4a6a | 975 | |
0cd088fc | 976 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); |
2773b024 | 977 | |
0cd088fc | 978 | BT_DBG("chan %p src type %d", chan, chan->src_type); |
6b8d4a6a | 979 | |
0cd088fc | 980 | err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP)); |
6b8d4a6a | 981 | if (err) { |
0cd088fc | 982 | l2cap_chan_put(chan); |
6b8d4a6a JR |
983 | BT_ERR("psm cannot be added err %d", err); |
984 | return NULL; | |
985 | } | |
986 | ||
0cd088fc | 987 | return chan; |
6b8d4a6a JR |
988 | } |
989 | ||
990 | static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, | |
991 | struct l2cap_conn **conn) | |
992 | { | |
993 | struct hci_conn *hcon; | |
994 | struct hci_dev *hdev; | |
6b8d4a6a JR |
995 | int n; |
996 | ||
997 | n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu", | |
998 | &addr->b[5], &addr->b[4], &addr->b[3], | |
999 | &addr->b[2], &addr->b[1], &addr->b[0], | |
1000 | addr_type); | |
1001 | ||
1002 | if (n < 7) | |
1003 | return -EINVAL; | |
1004 | ||
39385cb5 JH |
1005 | /* The LE_PUBLIC address type is ignored because of BDADDR_ANY */ |
1006 | hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC); | |
6b8d4a6a JR |
1007 | if (!hdev) |
1008 | return -ENOENT; | |
1009 | ||
1010 | hci_dev_lock(hdev); | |
f5ad4ffc | 1011 | hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type); |
6b8d4a6a JR |
1012 | hci_dev_unlock(hdev); |
1013 | ||
1014 | if (!hcon) | |
1015 | return -ENOENT; | |
1016 | ||
1017 | *conn = (struct l2cap_conn *)hcon->l2cap_data; | |
1018 | ||
1019 | BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type); | |
1020 | ||
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | static void disconnect_all_peers(void) | |
1025 | { | |
2e4d60cb | 1026 | struct lowpan_btle_dev *entry; |
6b8d4a6a JR |
1027 | struct lowpan_peer *peer, *tmp_peer, *new_peer; |
1028 | struct list_head peers; | |
6b8d4a6a JR |
1029 | |
1030 | INIT_LIST_HEAD(&peers); | |
1031 | ||
1032 | /* We make a separate list of peers as the close_cb() will | |
1033 | * modify the device peers list so it is better not to mess | |
1034 | * with the same list at the same time. | |
1035 | */ | |
1036 | ||
90305829 | 1037 | rcu_read_lock(); |
6b8d4a6a | 1038 | |
90305829 JR |
1039 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
1040 | list_for_each_entry_rcu(peer, &entry->peers, list) { | |
6b8d4a6a JR |
1041 | new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC); |
1042 | if (!new_peer) | |
1043 | break; | |
1044 | ||
1045 | new_peer->chan = peer->chan; | |
1046 | INIT_LIST_HEAD(&new_peer->list); | |
1047 | ||
1048 | list_add(&new_peer->list, &peers); | |
1049 | } | |
1050 | } | |
1051 | ||
90305829 | 1052 | rcu_read_unlock(); |
6b8d4a6a | 1053 | |
90305829 | 1054 | spin_lock(&devices_lock); |
6b8d4a6a JR |
1055 | list_for_each_entry_safe(peer, tmp_peer, &peers, list) { |
1056 | l2cap_chan_close(peer->chan, ENOENT); | |
90305829 JR |
1057 | |
1058 | list_del_rcu(&peer->list); | |
4e790226 | 1059 | kfree_rcu(peer, rcu); |
6b8d4a6a | 1060 | } |
90305829 | 1061 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1062 | } |
1063 | ||
7b2ed60e | 1064 | struct set_enable { |
90305829 | 1065 | struct work_struct work; |
7b2ed60e | 1066 | bool flag; |
90305829 | 1067 | }; |
6b8d4a6a | 1068 | |
7b2ed60e | 1069 | static void do_enable_set(struct work_struct *work) |
90305829 | 1070 | { |
7b2ed60e JR |
1071 | struct set_enable *set_enable = container_of(work, |
1072 | struct set_enable, work); | |
90305829 | 1073 | |
7b2ed60e | 1074 | if (!set_enable->flag || enable_6lowpan != set_enable->flag) |
6b8d4a6a | 1075 | /* Disconnect existing connections if 6lowpan is |
7b2ed60e | 1076 | * disabled |
6b8d4a6a JR |
1077 | */ |
1078 | disconnect_all_peers(); | |
1079 | ||
7b2ed60e | 1080 | enable_6lowpan = set_enable->flag; |
6b8d4a6a | 1081 | |
f9c70bdc | 1082 | mutex_lock(&set_lock); |
6b8d4a6a JR |
1083 | if (listen_chan) { |
1084 | l2cap_chan_close(listen_chan, 0); | |
1085 | l2cap_chan_put(listen_chan); | |
1086 | } | |
1087 | ||
1088 | listen_chan = bt_6lowpan_listen(); | |
f9c70bdc | 1089 | mutex_unlock(&set_lock); |
6b8d4a6a | 1090 | |
7b2ed60e | 1091 | kfree(set_enable); |
90305829 JR |
1092 | } |
1093 | ||
7b2ed60e | 1094 | static int lowpan_enable_set(void *data, u64 val) |
90305829 | 1095 | { |
7b2ed60e | 1096 | struct set_enable *set_enable; |
90305829 | 1097 | |
7b2ed60e JR |
1098 | set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL); |
1099 | if (!set_enable) | |
90305829 JR |
1100 | return -ENOMEM; |
1101 | ||
7b2ed60e JR |
1102 | set_enable->flag = !!val; |
1103 | INIT_WORK(&set_enable->work, do_enable_set); | |
90305829 | 1104 | |
7b2ed60e | 1105 | schedule_work(&set_enable->work); |
90305829 | 1106 | |
6b8d4a6a JR |
1107 | return 0; |
1108 | } | |
1109 | ||
7b2ed60e | 1110 | static int lowpan_enable_get(void *data, u64 *val) |
6b8d4a6a | 1111 | { |
7b2ed60e | 1112 | *val = enable_6lowpan; |
6b8d4a6a JR |
1113 | return 0; |
1114 | } | |
1115 | ||
e250fab6 Y |
1116 | DEFINE_DEBUGFS_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get, |
1117 | lowpan_enable_set, "%llu\n"); | |
6b8d4a6a JR |
1118 | |
1119 | static ssize_t lowpan_control_write(struct file *fp, | |
1120 | const char __user *user_buffer, | |
1121 | size_t count, | |
1122 | loff_t *position) | |
1123 | { | |
1124 | char buf[32]; | |
1125 | size_t buf_size = min(count, sizeof(buf) - 1); | |
1126 | int ret; | |
1127 | bdaddr_t addr; | |
1128 | u8 addr_type; | |
1129 | struct l2cap_conn *conn = NULL; | |
1130 | ||
1131 | if (copy_from_user(buf, user_buffer, buf_size)) | |
1132 | return -EFAULT; | |
1133 | ||
1134 | buf[buf_size] = '\0'; | |
1135 | ||
1136 | if (memcmp(buf, "connect ", 8) == 0) { | |
1137 | ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn); | |
1138 | if (ret == -EINVAL) | |
1139 | return ret; | |
1140 | ||
f9c70bdc | 1141 | mutex_lock(&set_lock); |
6b8d4a6a JR |
1142 | if (listen_chan) { |
1143 | l2cap_chan_close(listen_chan, 0); | |
1144 | l2cap_chan_put(listen_chan); | |
1145 | listen_chan = NULL; | |
1146 | } | |
f9c70bdc | 1147 | mutex_unlock(&set_lock); |
6b8d4a6a JR |
1148 | |
1149 | if (conn) { | |
1150 | struct lowpan_peer *peer; | |
1151 | ||
1152 | if (!is_bt_6lowpan(conn->hcon)) | |
1153 | return -EINVAL; | |
1154 | ||
1155 | peer = lookup_peer(conn); | |
1156 | if (peer) { | |
1157 | BT_DBG("6LoWPAN connection already exists"); | |
1158 | return -EALREADY; | |
1159 | } | |
1160 | ||
1161 | BT_DBG("conn %p dst %pMR type %d user %d", conn, | |
1162 | &conn->hcon->dst, conn->hcon->dst_type, | |
1163 | addr_type); | |
1164 | } | |
1165 | ||
1166 | ret = bt_6lowpan_connect(&addr, addr_type); | |
1167 | if (ret < 0) | |
1168 | return ret; | |
1169 | ||
1170 | return count; | |
1171 | } | |
1172 | ||
1173 | if (memcmp(buf, "disconnect ", 11) == 0) { | |
1174 | ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn); | |
1175 | if (ret < 0) | |
1176 | return ret; | |
1177 | ||
1178 | ret = bt_6lowpan_disconnect(conn, addr_type); | |
1179 | if (ret < 0) | |
1180 | return ret; | |
1181 | ||
1182 | return count; | |
1183 | } | |
1184 | ||
1185 | return count; | |
1186 | } | |
1187 | ||
1188 | static int lowpan_control_show(struct seq_file *f, void *ptr) | |
1189 | { | |
2e4d60cb | 1190 | struct lowpan_btle_dev *entry; |
90305829 | 1191 | struct lowpan_peer *peer; |
6b8d4a6a | 1192 | |
90305829 | 1193 | spin_lock(&devices_lock); |
6b8d4a6a | 1194 | |
90305829 JR |
1195 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { |
1196 | list_for_each_entry(peer, &entry->peers, list) | |
6b8d4a6a JR |
1197 | seq_printf(f, "%pMR (type %u)\n", |
1198 | &peer->chan->dst, peer->chan->dst_type); | |
1199 | } | |
1200 | ||
90305829 | 1201 | spin_unlock(&devices_lock); |
6b8d4a6a JR |
1202 | |
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | static int lowpan_control_open(struct inode *inode, struct file *file) | |
1207 | { | |
1208 | return single_open(file, lowpan_control_show, inode->i_private); | |
1209 | } | |
1210 | ||
1211 | static const struct file_operations lowpan_control_fops = { | |
1212 | .open = lowpan_control_open, | |
1213 | .read = seq_read, | |
1214 | .write = lowpan_control_write, | |
1215 | .llseek = seq_lseek, | |
1216 | .release = single_release, | |
1217 | }; | |
1218 | ||
7f118253 JR |
1219 | static void disconnect_devices(void) |
1220 | { | |
2e4d60cb | 1221 | struct lowpan_btle_dev *entry, *tmp, *new_dev; |
7f118253 | 1222 | struct list_head devices; |
7f118253 JR |
1223 | |
1224 | INIT_LIST_HEAD(&devices); | |
1225 | ||
1226 | /* We make a separate list of devices because the unregister_netdev() | |
1227 | * will call device_event() which will also want to modify the same | |
1228 | * devices list. | |
1229 | */ | |
1230 | ||
90305829 | 1231 | rcu_read_lock(); |
7f118253 | 1232 | |
90305829 | 1233 | list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) { |
7f118253 JR |
1234 | new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC); |
1235 | if (!new_dev) | |
1236 | break; | |
1237 | ||
1238 | new_dev->netdev = entry->netdev; | |
1239 | INIT_LIST_HEAD(&new_dev->list); | |
1240 | ||
90305829 | 1241 | list_add_rcu(&new_dev->list, &devices); |
7f118253 JR |
1242 | } |
1243 | ||
90305829 | 1244 | rcu_read_unlock(); |
7f118253 | 1245 | |
daac197c | 1246 | list_for_each_entry_safe(entry, tmp, &devices, list) { |
7f118253 JR |
1247 | ifdown(entry->netdev); |
1248 | BT_DBG("Unregistering netdev %s %p", | |
1249 | entry->netdev->name, entry->netdev); | |
00f59314 | 1250 | lowpan_unregister_netdev(entry->netdev); |
7f118253 JR |
1251 | kfree(entry); |
1252 | } | |
1253 | } | |
1254 | ||
18722c24 JR |
1255 | static int device_event(struct notifier_block *unused, |
1256 | unsigned long event, void *ptr) | |
1257 | { | |
1258 | struct net_device *netdev = netdev_notifier_info_to_dev(ptr); | |
2e4d60cb | 1259 | struct lowpan_btle_dev *entry; |
18722c24 JR |
1260 | |
1261 | if (netdev->type != ARPHRD_6LOWPAN) | |
1262 | return NOTIFY_DONE; | |
1263 | ||
1264 | switch (event) { | |
1265 | case NETDEV_UNREGISTER: | |
90305829 JR |
1266 | spin_lock(&devices_lock); |
1267 | list_for_each_entry(entry, &bt_6lowpan_devices, list) { | |
18722c24 | 1268 | if (entry->netdev == netdev) { |
7f118253 JR |
1269 | BT_DBG("Unregistered netdev %s %p", |
1270 | netdev->name, netdev); | |
18722c24 | 1271 | list_del(&entry->list); |
18722c24 JR |
1272 | break; |
1273 | } | |
1274 | } | |
90305829 | 1275 | spin_unlock(&devices_lock); |
18722c24 JR |
1276 | break; |
1277 | } | |
1278 | ||
1279 | return NOTIFY_DONE; | |
1280 | } | |
1281 | ||
1282 | static struct notifier_block bt_6lowpan_dev_notifier = { | |
1283 | .notifier_call = device_event, | |
1284 | }; | |
1285 | ||
5547e48c | 1286 | static int __init bt_6lowpan_init(void) |
18722c24 | 1287 | { |
e250fab6 Y |
1288 | lowpan_enable_debugfs = debugfs_create_file_unsafe("6lowpan_enable", |
1289 | 0644, bt_debugfs, | |
1290 | NULL, | |
1291 | &lowpan_enable_fops); | |
6b8d4a6a JR |
1292 | lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644, |
1293 | bt_debugfs, NULL, | |
1294 | &lowpan_control_fops); | |
1295 | ||
18722c24 JR |
1296 | return register_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1297 | } | |
1298 | ||
5547e48c | 1299 | static void __exit bt_6lowpan_exit(void) |
18722c24 | 1300 | { |
7b2ed60e | 1301 | debugfs_remove(lowpan_enable_debugfs); |
6b8d4a6a JR |
1302 | debugfs_remove(lowpan_control_debugfs); |
1303 | ||
1304 | if (listen_chan) { | |
1305 | l2cap_chan_close(listen_chan, 0); | |
1306 | l2cap_chan_put(listen_chan); | |
1307 | } | |
1308 | ||
7f118253 JR |
1309 | disconnect_devices(); |
1310 | ||
18722c24 JR |
1311 | unregister_netdevice_notifier(&bt_6lowpan_dev_notifier); |
1312 | } | |
5547e48c JR |
1313 | |
1314 | module_init(bt_6lowpan_init); | |
1315 | module_exit(bt_6lowpan_exit); | |
1316 | ||
1317 | MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>"); | |
1318 | MODULE_DESCRIPTION("Bluetooth 6LoWPAN"); | |
1319 | MODULE_VERSION(VERSION); | |
1320 | MODULE_LICENSE("GPL"); |